CN114636047A - Stainless steel lining repairing method for heat distribution pipeline - Google Patents
Stainless steel lining repairing method for heat distribution pipeline Download PDFInfo
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- CN114636047A CN114636047A CN202210378658.0A CN202210378658A CN114636047A CN 114636047 A CN114636047 A CN 114636047A CN 202210378658 A CN202210378658 A CN 202210378658A CN 114636047 A CN114636047 A CN 114636047A
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- steel lining
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- pipe
- lining pipe
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 102
- 239000010935 stainless steel Substances 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000009826 distribution Methods 0.000 title claims description 5
- 238000010276 construction Methods 0.000 claims abstract description 29
- 239000002002 slurry Substances 0.000 claims abstract description 28
- 230000008439 repair process Effects 0.000 claims abstract description 20
- 230000002968 anti-fracture Effects 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 7
- 230000001050 lubricating effect Effects 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 210000002445 nipple Anatomy 0.000 claims description 5
- 230000000740 bleeding effect Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims 1
- 238000007569 slipcasting Methods 0.000 claims 1
- 230000008602 contraction Effects 0.000 abstract description 5
- 230000035515 penetration Effects 0.000 description 7
- 238000003466 welding Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 229920001903 high density polyethylene Polymers 0.000 description 3
- 239000004700 high-density polyethylene Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000009629 microbiological culture Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
- F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
- F16L55/1657—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section lengths of rigid pipe being inserted
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
- F16L55/1645—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing material being introduced inside the pipe by means of a tool moving in the pipe
- F16L55/16455—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing material being introduced inside the pipe by means of a tool moving in the pipe a part of the tool defining, together with the inner wall of the pipe, an enclosed space into which sealing material is injected
Abstract
The invention discloses a method for repairing a stainless steel lining of a thermal pipeline, which adopts the repair construction of pressurizing and pouring, and specifically comprises the following steps: dragging the stainless steel lining pipe into the pipeline to be repaired, and erecting the stainless steel lining pipe in the pipeline to be repaired, so that an annular gap between the stainless steel lining pipe and the pipeline to be repaired forms a sealed annular pouring chamber; and plugging and pressurizing two ends of the stainless steel lining pipe, pouring slurry into the sealed annular pouring chamber in a pressure-maintaining state, releasing pressure after the slurry is solidified for a certain time, and forming an anti-fracture annular gap between the solidified layer and the outer wall of the stainless steel lining pipe after the slurry is hardened. The invention is used for grouting under the pressure state of the stainless steel lining pipe, which not only can prevent the stainless steel lining pipe from being flattened, but also can ensure that an annular gap exists between a hardened solidified layer and the stainless steel lining pipe, provide a certain deformation space for stainless steel, effectively prevent deformation and breakage caused by expansion with heat and contraction with cold, and ensure the whole pressure bearing property and impact resistance of the pipeline.
Description
Technical Field
The invention relates to the field of pipeline repair, in particular to a method for repairing a stainless steel lining of a thermal pipeline.
Background
The pipeline repairing is to restore the normal use function of the damaged or leaked conveying pipeline by adopting a repairing technology. Currently, common pipe repair methods include both in-situ excavation repair and trenchless lining repair. The trenchless lining repairing method mainly comprises HDPE (high-density polyethylene) pipe lining repairing, CIPP (clean in place) overturning lining repairing and stainless steel pipe lining repairing, and the lining pipes used for the HDPE lining repairing and the CIPP overturning lining repairing are not high-temperature resistant, so that the trenchless repairing requirement of the pipeline with higher medium temperature cannot be met. Thus, in actual projects, the repair of thermal pipelines that do not meet the conditions of excavation in the field is usually done by stainless steel lining repair.
The stainless steel lining repair technology is mainly characterized in that stainless steel pipe blanks serving as linings are welded together in a pipeline to be repaired, and then slurry is directly poured in a gap between the stainless steel pipe and the pipeline to be repaired, so that the pipeline is repaired. However, the heat distribution pipeline has a relatively small pipe diameter, so that welding construction cannot be performed inside the pipeline, in addition, rigid connection is generally adopted between the existing stainless steel lining pipe and the pipeline to be repaired, the stainless steel lining pipe is easy to break in the using process, and the service life is short.
Disclosure of Invention
In view of the above, the present invention provides a method for repairing a stainless steel lining of a thermal pipeline, which is different from the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to a stainless steel lining repairing method of a thermal power pipeline, which adopts the repairing construction of firstly pressurizing and then pouring after the completion of the working procedures of cleaning pipes and slurry, and specifically comprises the following steps:
dragging the welded stainless steel lining pipe into the pipeline to be repaired, and erecting the stainless steel lining pipe in the pipeline to be repaired by using a plugging support structure, so that a sealed annular pouring chamber is formed in an annular gap between the stainless steel lining pipe and the pipeline to be repaired;
plugging and pressurizing two ends of the stainless steel lining pipe, pouring slurry into the sealed annular pouring chamber in a pressure maintaining state, releasing pressure of the stainless steel lining pipe after the slurry is solidified for a certain time, and forming an anti-fracture annular gap between a solidified layer and the outer wall of the stainless steel lining pipe after the slurry is hardened.
The beneficial effects are that: the invention is used for grouting under the pressure state of the stainless steel lining pipe, which not only can prevent the stainless steel lining pipe from being flattened, but also can ensure that an annular gap exists between a hardened solidified layer and the stainless steel lining pipe, provide a certain deformation space for stainless steel, effectively avoid deformation and fracture caused by thermal expansion and cold contraction, and further ensure the integral pressure bearing property and impact resistance of the pipeline.
Preferably, the repair construction is performed in sections, and an inner compensator and an outer compensator are installed at the joint of the two sections of pipelines to be repaired. The invention adopts the sectional construction, the internal and external compensation amount between the two sections of pipelines can effectively avoid the cracking caused by the different expansion coefficients of the stainless steel lining pipe and the pipeline, and the service life of the repaired pipe section is prolonged.
More preferably, the inner compensator and the outer compensator are both external pressure axial type corrugated pipe compensators, which not only can effectively absorb axial displacement, but also have good heat preservation performance.
Preferably, before the stainless steel lining pipe is dragged into the pipeline, the stainless steel pipe nipple is used for trying, and the lubricating powder is brought into the pipeline to be repaired (particularly the bottom of the pipeline to be repaired). The beneficial effects are that: the scratch and the traction force change condition generated by the try-on can provide reference data for formal penetration; in addition, the lubricant powder brought by the test wearing has a lubricating effect, so that the friction force between the stainless steel lining pipe and the pipeline can be reduced, and smooth pipe penetration is ensured.
Preferably, the plugging support structure comprises a slurry blocking ring and a plugging block which are arranged at two ends of the annular gap, the slurry blocking ring is provided with an arc-shaped support groove matched with the outer wall of the pipeline, so that the stainless steel lining pipe and the pipeline are concentric, the stainless steel lining pipe and the pipeline are concentric without a support to be additionally lifted, and the structure is ingenious.
Preferably, the pipeline is provided with a grouting hole and an exhaust hole, and the annular pouring chamber is grouted through the grouting hole. The grouting device has the beneficial effects that the grouting is carried out outside the pipeline, the working space is large, and the construction is convenient.
Preferably, the slurry is high-strength non-shrinkage grouting material, the 3-day compressive strength of the high-strength non-shrinkage grouting material is more than 45MPa, the 28-day compressive strength is more than 87MPa, the vertical expansion rate in 3h is 0.25, the initial value of the truncated cone fluidity is not less than 320mm, the truncated cone fluidity in 30min is not less than 260mm, and the bleeding rate is 0%.
The beneficial effects are that: the slurry of the invention not only does not bleed, but also has the characteristics of good fluidity, early strength and high strength, good durability and no corrosion, can ensure that the whole annular pouring cavity is filled during pouring, can also ensure the strength of a solidified layer after hardening, effectively ensures the overall performance of repairing a pipeline,
according to the invention, after the pipe cleaning process, the stainless steel lining repair is carried out by adopting the repair construction of firstly pressurizing and then grouting, namely grouting is carried out under the pressure state of the stainless steel lining pipe, so that the stainless steel lining pipe is prevented from being flattened in the grouting process, a small annular gap is formed between a solidification layer and the stainless steel lining pipe, a certain deformation space is provided, the deformation or the fracture caused by expansion with heat and contraction with cold is avoided, and the integral pressure bearing property and the impact resistance of the pipeline are effectively ensured.
The stainless steel lining repairing method adopts segmented construction, can simultaneously carry out grouting repair on two or more sections of pipelines, improves the repairing efficiency and shortens the construction period; the adoption of the sectional construction also facilitates the installation of the inner compensator and the outer compensator, the axial displacement of the stainless steel lining pipe and the original pipeline is absorbed, the breakage caused by the different expansion coefficients of the stainless steel lining pipe and the original pipeline is avoided, and the service life of the repair section is prolonged.
Drawings
FIG. 1 is a view showing the construction state of the present invention (stainless steel lining pipe is pulled into a pipe to be repaired).
Fig. 2 is a construction state diagram (adding a plugging support structure and a pressure test blind plate) of the invention.
FIG. 3 is a view showing a construction state (pressurized grouting) of the present invention.
FIG. 4 is a view showing a construction state of the present invention (with an internal compensator and an external compensator added).
Detailed Description
The following will take the repair of a certain heat supply pipeline (heat supply pipeline DN 500) in Beijing as an example, and will explain the method for repairing the stainless steel lining of the heat supply pipeline in detail with reference to the attached drawings.
The length of the pipeline needing to be repaired on the original heat supply pipeline is about 346.1m, the pipeline is seriously corroded at the section, an accident happens in a heating season every year in recent years, large excavation conditions are not provided on the site, a stainless steel lining pipe of DN450-DN478 is replaced by the original DN500 pipeline by adopting trenchless repair in the original heat supply pipeline (DN 500) during repair, and the specific construction method comprises the following contents:
the first step, the section to be repaired of the heat supply pipeline 2 is provided with three working wells, and the left working well and the middle working well are excavated to be used as operation wells; because the right working well has no construction conditions, a new operating well is additionally selected and excavated at one side of the working well (during actual construction, the existing working well of the heat supply pipeline is used as much as possible, and if the existing working well does not meet the construction conditions, the new operating well is additionally selected and excavated according to the actual conditions);
for the sake of distinction, the middle operating well is marked 1#Operating wells, the operating wells on both sides being recorded as2#Operating the well;
secondly, disconnecting two ends of the pipeline 1 to be repaired from the heat supply pipeline 2, and respectively additionally installing sealing blind plates 3 at two pipeline openings of the heat supply pipeline 2, so that hot water in the heat supply pipeline 2 is prevented from overflowing and scalding construction personnel due to valve failure in the construction process, and the safety is improved;
then will 1#The operating well is used as a segmental construction node, and the pipeline 1 to be repaired is divided into two sections, wherein the length of one section is 229.5m, and the length of the other section is 116.6 m; certainly, the pipeline 1 to be repaired can be divided into three or four sections according to the actual construction condition and the repair length;
thirdly, installing a traction device (provided with a guide wheel, a pulley 4.1 and a traction machine 4.2); each section of pipeline 1 corresponds to a set of traction equipment so as to be convenient for trying on and threading; taking the installation of one set of traction equipment as an example: a guide wheel is arranged at one end of the pipeline 1 to be repaired, a tractor 4.2 is arranged on the ground at the other end, a pulley 4.1 is arranged on a sealing blind plate 3 of the heat supply pipeline, and the traction direction of the tractor 4.2 is from 1#Operating well direction 2#Operating well traction;
of course, if the actual construction site is not allowed, the tractor 4.2 can be placed at 1#The position near the operation well is subjected to reverse traction (namely, the stainless steel lining pipe 5 is pulled from 2 to 2)#Dragging the operation well into the pipeline to be repaired);
fourthly, the inner walls of the two sections of pipelines to be repaired are cleaned respectively by using a pipe cleaning device (comprising a leather cup pipe cleaner, a straight plate pipe cleaner and a wire brush pipe cleaner) which is pulled by a tractor 4.2, the inner walls of the pipelines are cleaned repeatedly by the leather cup pipe cleaner, the straight plate pipe cleaner and the wire brush pipe cleaner, and high-pressure flushing and polishing treatment are carried out, so that the inner walls of the pipelines to be repaired are ensured not to have burrs, sharp substances and the like, and the stainless steel lining pipe 5 is further ensured not to be scratched when being inserted;
fifthly, in order to further reduce the interference between the pipeline 1 to be repaired and the stainless steel lining pipe 5, after the pipe is cleaned, high-strength non-shrinkage grouting material is used for performing grouting treatment on the uneven position of the bottom of the pipeline;
sixthly, after finishing the slurry flowing of the pipeline, utilizing a stainless steel pipe nipple to perform trial penetration, specifically:
welding a traction head at the end of a stainless steel pipe short section (DN 478, length 6 m), and enabling the stainless steel pipe to be 1 st by utilizing a traction machine 4.2#The operation well enters the pipeline and penetrates out of the other end of the pipeline 1 to be repaired, and the scratches on the outer surface of the stainless steel pipe nipple and the traction force change condition provide reference data for formal penetration;
before trial penetration and insertion, lubricating powder is smeared on the outer wall of the stainless steel pipe nipple, and in the penetration process, the lubricating powder can be brought into the pipeline 1 to be repaired (particularly the bottom of the pipeline) so as to reduce the friction force between the stainless steel lining pipe 5 and the pipeline to be repaired during formal pipe penetration;
seventhly, welding a plurality of sections of stainless steel pipes (DN 478 and 6m in length) together to form a stainless steel lining pipe 5 according to the length of the pipeline 1 to be repaired, additionally arranging a traction head at the traction end of the stainless steel lining pipe 5, checking a welding seam and passivating; the stainless steel lining pipe 5 is pulled from 1 by a tractor 4.2#The operation well is drawn into the pipeline 1 to be repaired (of course, according to the actual situation, it can be from 2)#The operation well pulls the stainless steel lining pipe to 1#Operating well direction movement); repeating the operation, and drawing another stainless steel lining pipe into another section of pipeline to be repaired, as shown in fig. 1;
in the traction process, lubricating powder is also coated on the outer wall of the stainless steel lining pipe 5 to reduce traction resistance;
eighthly, after the stainless steel lining pipe 5 is pulled in place, additionally arranging plugging support structures (the plugging support structures comprise a slurry blocking ring 6 and a plugging block 7) at two ends of the stainless steel lining pipe 5, and respectively welding the slurry blocking ring 6 and the plugging block 7 at two ends of an annular gap between the stainless steel lining pipe 5 and the pipeline, as shown in fig. 2; wherein:
the plugging block 7 is preferably a metal block; the slurry blocking ring 6 is of a crescent structure, has a plugging function, effectively prevents slurry from overflowing from two ends of the annular gap, and has a supporting function, so that the stainless steel lining pipe 5 and the pipeline are positioned at the same center, and a bracket is not required to be additionally installed;
arranging a plurality of grouting holes 1.1 and a plurality of exhaust holes 1.2 on the pipeline 1 to be repaired, wherein the exhaust holes 1.2 are arranged at intervals along the length direction of the pipeline so as to facilitate exhaust;
ninthly, respectively additionally arranging pressure test blind plates 8 at two ends of the stainless steel lining pipe 5, arranging a pipe joint and a valve 9 on one pressure test blind plate 8, arranging an exhaust pipe and a pressure gauge 10 on the other pressure test blind plate 8, and sequentially carrying out bare pipe pressure test and water filling pressure test on the stainless steel lining pipe 5, wherein the steps are specifically shown in fig. 2;
under the pressurizing state of the stainless steel lining pipe 5 (the pressure is 1.6 Mpa), slurry is injected into the annular pouring chamber F through the grouting holes 1.1, and the pressure of the stainless steel lining pipe 5 is relieved after the slurry is initially solidified for 4 hours; a tiny annular gap is formed between the solidified layer and the outer wall of the stainless steel lining pipe 5 after the slurry is hardened, so that the stainless steel lining pipe is prevented from being broken due to thermal expansion and cold contraction, and the safety is improved;
the high-strength non-shrinkage grouting material is an inorganic slurry (such as CGM (China general microbiological culture Collection center) type high-strength non-shrinkage grouting material of doctor Shi), has small corrosivity, small influence on a pipeline and good durability, and in addition, the initial value of the truncated cone fluidity of the high-strength non-shrinkage grouting material is larger than 320mm, the truncated cone fluidity at 30min is larger than 260mm, the bleeding rate is 0 percent, the high-strength non-shrinkage grouting material has good fluidity and can fill the annular pouring cavity F;
when the high-strength non-shrinkage grouting material is prepared, the mass ratio of the high-strength non-shrinkage grouting material to water is 6.5:50 (namely the addition amount of water is 13 percent of the high-strength non-shrinkage grouting material), the 3-day compressive strength of the high-strength non-shrinkage grouting material is more than 60MPa, the 28-day compressive strength of the high-strength non-shrinkage grouting material is more than 87MPa, the vertical expansion rate within 3h is 0.25, and the expansion difference between 24h and 3h is 0.23, so that the high-strength non-shrinkage grouting material not only can fill the whole annular pouring cavity F, but also has higher strength, and the integral pressure-bearing performance of a repair section is improved;
tenth, after the slurry is hardened, performing a pressure test on the stainless steel lining pipe 5 according to the relevant construction specifications of the heat supply pipeline 2 (such as CJJ/T81-2013 in the technical Specification of urban heat supply direct-burial hot water pipeline engineering);
step eleven, after the pressure test is qualified, removing the pressure test blind plates 8 at two ends of the stainless steel lining pipe 5, and adding an inner compensator 11 and an outer compensator 12 (specifically shown in fig. 4) at the joint of the two sections of pipelines, specifically:
welding the two stainless steel lining pipes 5 together by using a connecting pipe, wherein an inner compensator 11 is additionally arranged on the connecting pipe; the end part of the pipeline is welded with a reducer pipe 13 (DN 500/DN 450), an external compensator 12 is additionally arranged between the two reducer pipes 13, the compensation amount of the internal compensator 11 and the external compensator 12 effectively avoids the fracture caused by the difference of the expansion coefficients of the stainless steel lining pipe 5 and the pipeline, and the service life of the repaired pipeline is prolonged;
during actual installation, the external pressure axial type corrugated pipe compensator is preferably selected as the inner compensator 11 and the outer compensator 12, so that axial displacement can be effectively absorbed, and the external pressure axial type corrugated pipe compensator has good heat preservation performance;
and a twelfth step of dismantling the sealing blind plate 3 of the pipeline opening of the heat supply pipeline 2, respectively connecting the two ends of the repaired pipeline 1 with the pipeline opening of the original heat supply pipeline 2, then repairing or backfilling the operation well, hardening the road surface, and finishing the stainless steel lining repairing operation of the heat distribution pipeline.
The invention adopts a repair method of pressurizing firstly and then grouting, namely grouting is carried out under the pressure state of the stainless steel lining pipe 5, so that the stainless steel lining pipe 5 is prevented from being flattened in the grouting process, a tiny annular gap can be ensured between a solidification layer and the stainless steel lining pipe 5, a certain deformation space is provided for the stainless steel lining pipe, the deformation or the fracture caused by expansion with heat and contraction with cold are avoided, and the integral pressure bearing performance and the impact resistance of the pipeline are effectively ensured.
The stainless steel lining repairing method adopts segmented construction, can simultaneously carry out two-segment or multi-segment stamping grouting repairing, improves the repairing efficiency and shortens the construction period; the adoption of the sectional construction also facilitates the installation of the inner compensator 12 and the outer compensator 12, respectively absorbs the axial displacement of the stainless steel lining pipe 5 and the old pipeline, avoids the breakage caused by the difference of the expansion coefficients of the stainless steel lining pipe 5 and the pipeline, ensures the service life of the repaired pipe section, and improves the safety.
Finally, it is emphasized that the above-described embodiments are merely preferred embodiments of the present invention, and not restrictive, and that, although the present invention has been described in detail with reference to the above-described embodiments, it will be apparent to those skilled in the art that modifications and variations can be made to the embodiments described in the above embodiments without inventive faculty, or equivalents may be substituted for some of the technical features. Therefore, any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A stainless steel lining repairing method for a heat distribution pipeline is characterized by comprising the following steps: adopt the restoration construction of filling earlier the back slip casting after the clear pipe thick liquid process is accomplished, specifically include:
dragging the welded stainless steel lining pipe into a pipeline to be repaired, and erecting the stainless steel lining pipe in the pipeline to be repaired by using a plugging support structure, so that an annular gap between the stainless steel lining pipe and the pipeline to be repaired forms a sealed annular pouring chamber;
plugging and pressurizing two ends of the stainless steel lining pipe, pouring slurry into the sealed annular pouring chamber in a pressure maintaining state, releasing pressure of the stainless steel lining pipe after the slurry is solidified for a certain time, and forming an anti-fracture annular gap between a solidified layer and the outer wall of the stainless steel lining pipe after the slurry is hardened.
2. A method of repairing a stainless steel lining of a thermodynamic pipe as claimed in claim 1, wherein: the repair construction is carried out in sections, and an inner compensator and an outer compensator are installed at the joint of the two sections of pipelines to be repaired.
3. A method of repairing a stainless steel lining of a thermodynamic pipe as claimed in claim 2, wherein: the inner compensator and the outer compensator are both external pressure axial type corrugated pipe compensators.
4. A method of repairing a stainless steel lining of a thermodynamic pipe as claimed in claim 2, wherein: before the stainless steel lining pipe is dragged into the pipeline to be repaired, a stainless steel pipe nipple is adopted to try on, and lubricating powder is brought into the pipeline to be repaired.
5. A method of repairing a stainless steel lining of a thermodynamic pipe as claimed in claim 2, wherein: the plugging support structure comprises a slurry blocking ring and a plugging block which are arranged at two ends of the annular gap, and the slurry blocking ring is of a crescent structure so that the stainless steel lining pipe and the pipeline are concentric.
6. A method of repairing a stainless steel lining of a thermodynamic pipe as claimed in claim 2, wherein: and the pipeline is provided with a grouting hole and an exhaust hole.
7. A method of repairing a stainless steel lining of a thermodynamic pipe as claimed in claim 2, wherein: the slurry is high-strength non-shrinkage grouting material, the 3-day compressive strength of the high-strength non-shrinkage grouting material is more than 45MPa, the 28-day compressive strength is more than 87MPa, the vertical expansion rate in 3h is 0.25, the initial value of the truncated cone fluidity is not less than 320mm, the truncated cone fluidity at 30min is not less than 260mm, and the bleeding rate is 0%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210378658.0A CN114636047B (en) | 2022-04-12 | 2022-04-12 | Stainless steel lining repairing method for heating pipeline |
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| CN202210378658.0A CN114636047B (en) | 2022-04-12 | 2022-04-12 | Stainless steel lining repairing method for heating pipeline |
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| CN116045124A (en) * | 2022-09-01 | 2023-05-02 | 河北天元地理信息科技工程有限公司 | Cement pipeline replacement repair process |
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| CN210890593U (en) * | 2019-12-06 | 2020-06-30 | 江苏恒力波纹管有限公司 | Stainless steel lined steel band |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116045124A (en) * | 2022-09-01 | 2023-05-02 | 河北天元地理信息科技工程有限公司 | Cement pipeline replacement repair process |
| CN116045124B (en) * | 2022-09-01 | 2024-02-02 | 河北天元地理信息科技工程有限公司 | Cement pipeline replacement repair process |
| CN115899441A (en) * | 2022-11-21 | 2023-04-04 | 白银有色动力有限公司 | Method for improving integral pressure bearing of stainless steel lining |
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